Element: <oj-button>

Oracle® JavaScript Extension Toolkit (JET)
8.0.0
F18189-01

Signature:

class ojButton<SP extends ojButtonSettableProperties = ojButtonSettableProperties>

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Attributes

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Methods

JET Custom Elements

JET components are implemented as custom HTML elements. In addition to the component attributes documented in this page, JET components also support standard HTML global attributes like id and aria-label.

The JET data binding syntax can be used to define both component and global attributes through the use of dynamically evaluated expressions. All attributes (component and global) support attribute-level binding by prefixing the attribute name with ":" (e.g. :id="[...]"). When using attribute-level binding, all expression values are treated as strings. Additionally, component attributes support property-level binding by using the attribute name directly with no ":" prefix. When using property-level binding, the expressions should evaluate to the types documented by the corresponding attributes. Property-level binding is strongly recommended over attribute-level binding for component attributes.

A detailed description of working with custom HTML elements can be found in: JET Custom Element Usage.



Version:
  • 8.0.0
Since:
  • 0.6.0
Module:
  • ojbutton

Module usage

See JET Module Loading for an overview of module usage within JET.

Typescript Import Format
//To typecheck the element APIs, import as below.
import {ojButton} from "ojs/ojbutton";

//For the transpiled javascript to load the element's module, import as below
import "ojs/ojbutton";

JET In Typescript

A detailed description of working with JET elements and classes in your typescript project can be found at: JET Typescript Usage.


JET Button

Description: Themeable, WAI-ARIA-compliant push buttons, with appropriate styles for hover, active, checked, and disabled.

To create toggle buttons, see the JET Buttonset. 

<oj-button id="myButton">
    <span>My Button</span>
</oj-button>

Push Buttons

Push buttons are ordinary buttons that do not stay pressed in when clicked. Push buttons are created from oj-button elements.

Anchor-based buttons are recommended only if native anchor functionality such as href navigation is desired. If only a click listener is needed, button-based buttons are recommended.

Buttonsets and Toolbars

The JET Buttonset component can be used to create toggle buttons or group related buttons, such as a group of radios or checkboxes. Buttonset provides visual and semantic grouping and WAI-ARIA-compliant focus management. See the Buttonset API doc for more information.

Also, buttons and buttonsets can be placed in a JET Toolbar. Like Buttonset, Toolbar is themable and provides WAI-ARIA-compliant focus management. See the Toolbar API doc for more information.

Touch End User Information

Target Gesture Action
Push Button Tap Push the button.
Toggle Button Tap Toggle the button.
Menu Button Tap Open the menu.

See also the Menu touch gesture doc.

Keyboard End User Information

Target Key Action
Push Button Enter or Space* Push the button.
Toggle Button Enter or Space Toggle the button.
Menu Button Enter, Space*, or DownArrow Open the menu.
Esc Close the menu.

* Some types of Push and Menu Buttons support Enter, not Space.

See the Menu keyboard doc for keystrokes that apply when focus is on the menu.

Accessibility

For accessibility, a JET Button must always have its default slot filled, even if it is icon-only.

See also the oj-focus-highlight discussion.

Disabled content: JET supports an accessible luminosity contrast ratio, as specified in WCAG 2.0 - Section 1.4.3 "Contrast", in the themes that are accessible. (See the "Theming" chapter of the JET Developer Guide for more information on which themes are accessible.) Note that Section 1.4.3 says that text or images of text that are part of an inactive user interface component have no contrast requirement. Because disabled content may not meet the minimum contrast ratio required of enabled content, it cannot be used to convey meaningful information.

Styling

The following CSS classes can be applied by the page author as needed.

Class Description
oj-button-sm
oj-button-lg
oj-button-xl		 Makes the button small, large, or extra large. Is applied to the Button's root element.
oj-button-primary Deprecated: this class is deprecated and will be removed in the future. Please use callToAction chroming instead. Draws attention to the button, often identifying the primary action in a set of buttons. Designed for use with a push button. In some themes, this class does nothing. Is applied to the Button's root element.
oj-button-confirm Identifies an action to confirm. Designed for use with a push button. Is applied to the Button's root element.
oj-focus-highlight Under normal circumstances this class is applied automatically. It is documented here for the rare cases that an app developer needs per-instance control.

The oj-focus-highlight class applies focus styling that may not be desirable when the focus results from pointer interaction (touch or mouse), but which is needed for accessibility when the focus occurs by a non-pointer mechanism, for example keyboard or initial page load.

The application-level behavior for this component is controlled in the theme by the $focusHighlightPolicy SASS variable; however, note that this same variable controls the focus highlight policy of many components and patterns. The values for the variable are:

  • nonPointer: oj-focus-highlight is applied only when focus is not the result of pointer interaction. Most themes default to this value.
  • all: oj-focus-highlight is applied regardless of the focus mechanism.
  • none: oj-focus-highlight is never applied. This behavior is not accessible, and is intended for use when the application wishes to use its own event listener to precisely control when the class is applied (see below). The application must ensure the accessibility of the result.

To change the behavior on a per-instance basis, the application can set the SASS variable as desired and then use event listeners to toggle this class as needed.

Performance

In lieu of stamping a button in a table, dataGrid, or other container, consider placing a single Button outside the container that acts on the currently selected row or cell.

Setting Component State

Built-in KO bindings, like KO's disable binding, should not be used for state with a JS API, since that is tatamount to updating the DOM directly. The component attribute should be bound instead.

State with no JS API should be set by manipulating the DOM directly in an allowable way, and then calling refresh() on the affected component(s). E.g. the reading direction (LTR / RTL) is changed by by setting the "dir" attribute on the <html> node and calling refresh().

When using a built-in Knockout binding, keep in mind that those bindings do not execute the necessary refresh() call after updating the DOM. Updates that flow from the component to the observable, as a result of user interaction, are not problematic. But updates in the other direction, that programmatically update the DOM because the observable changed, will not be picked up until the next refresh().

Note: Application logic should not interact with the component's properties or invoke its methods until the BusyContext indicates that the component is ready for interaction.

Slots

JET components that allow child content support slots. Please see the slots section of the JET component overview doc for more information on allowed slot content and slot types.

Default

The default slot is the button's text label. The <oj-button> element accepts plain text or DOM nodes as children for the default slot. A default slot label is required for all buttons for accessibility purposes. The label can be hidden using the display attribute.

If a text node is provided it will be wrapped in a span.

contextMenu

The contextMenu slot is set on the oj-menu within this element. This is used to designate the JET Menu that this component should launch as a context menu on right-click, Shift-F10, Press & Hold, or component-specific gesture. If specified, the browser's native context menu will be replaced by the JET Menu specified in this slot.

The application can register a listener for the Menu's ojBeforeOpen event. The listener can cancel the launch via event.preventDefault(), or it can customize the menu contents by editing the menu DOM directly, and then calling refresh() on the Menu.

To help determine whether it's appropriate to cancel the launch or customize the menu, the ojBeforeOpen listener can use component API's to determine which table cell, chart item, etc., is the target of the context menu. See the JSDoc of the individual components for details.

Keep in mind that any such logic must work whether the context menu was launched via right-click, Shift-F10, Press & Hold, or component-specific touch gesture.

endIcon

The endIcon slot is the button's end icon. The <oj-button> element accepts DOM nodes as children with the endIcon slot.

startIcon

The startIcon slot is the button's start icon. The <oj-button> element accepts DOM nodes as children with the startIcon slot.

Attributes

chroming :"solid"|"outlined"|"borderless"|"callToAction"|"full"|"half"

Indicates in what states the button has chrome (background and border).

The default chroming varies by theme and containership as follows:

  • If the button is in a buttonset or toolbar, then the default chroming is the current chroming value of the nearest such container.
  • Else, if $buttonChromingOptionDefault is set in the current theme as seen in the example below, then that value is the chroming default.
  • Else, the default chroming is "solid".

Once a value has been set on this button attribute, that value applies regardless of theme and containership.

Supported Values:
Value Description
"borderless" Borderless buttons are the least prominent variation. Borderless buttons are useful for supplemental actions that require minimal emphasis.
"callToAction" A Call To Action (CTA) button guides the user to take or complete the action that is the main goal of the page or page section. There should only be one CTA button on a page at any given time.
"full" Deprecated: this value is deprecated and will be removed in the future. Please use solid instead. In typical themes, full-chrome buttons always have chrome.
"half" Deprecated: this value is deprecated and will be removed in the future. Please use borderless instead. In typical themes, half-chrome buttons acquire chrome only in their hover, active, and selected states.
"outlined" Outlined buttons are salient, but lighter weight than solid buttons. Outlined buttons are useful for secondary actions.
"solid" Solid buttons stand out, and direct the user's attention to the most important actions in the UI.
Names
Item Name
Property chroming
Property change event chromingChanged
Property change listener attribute (must be of type function, see Events and Listeners for additional information.) on-chroming-changed

disabled :boolean

Disables the button if set to true.

After create time, the disabled state should be set via this API, not by setting the underlying DOM attribute.

Default Value:
  • false
Names
Item Name
Property disabled
Property change event disabledChanged
Property change listener attribute (must be of type function, see Events and Listeners for additional information.) on-disabled-changed

display :"all"|"icons"

Whether to display both the label and icons ("all") or just the icons ("icons"). In the latter case, the label is displayed in a tooltip instead, unless a tooltip was already supplied at create time.

For accessibility, a JET Button must always have a label set via the default slot, even if it is icon-only.

Supported Values:
Value Description
"all" Display both the label and icons.
"icons" Display only the icons.
Default Value:
  • "all"
Names
Item Name
Property display
Property change event displayChanged
Property change listener attribute (must be of type function, see Events and Listeners for additional information.) on-display-changed

translations :object|null

A collection of translated resources from the translation bundle, or null if this component has no resources. Resources may be accessed and overridden individually or collectively, as seen in the examples.

If the component does not contain any translatable resource, the default value of this attribute will be null. If not, an object containing all resources relevant to the component.

If this component has translations, their documentation immediately follows this doc entry.

Names
Item Name
Property translations
Property change event translationsChanged
Property change listener attribute (must be of type function, see Events and Listeners for additional information.) on-translations-changed

Events

ojAction

Triggered when a button is clicked. This will be triggered by keyboard events as well as mouse/touch events.

To ensure keyboard accessibility, the only correct, supported way to react to the click of a button is to listen for this event. Click listeners and href navigation should not be used.

See Events and Listeners for additional information.

Since:
  • 5.0.0

Methods

getProperty(property) : {any}

Retrieves the value of a property or a subproperty. The return type will be the same as the type of the property as specified in this API document. If the method is invoked with an incorrect property/subproperty name, it returns undefined.
Parameters:
Name Type Description
property string The property name to get. Supports dot notation for subproperty access.
Since:
  • 4.0.0
Returns:
Type
any
Example

Get a single subproperty of a complex property:

let subpropValue = myComponent.getProperty('complexProperty.subProperty1.subProperty2');

refresh() : {void}

Refreshes the component.
Returns:
Type
void

setProperties(properties) : {void}

Performs a batch set of properties. The type of value for each property being set must match the type of the property as specified in this API document.
Parameters:
Name Type Description
properties Object An object containing the property and value pairs to set.
Since:
  • 4.0.0
Returns:
Type
void
Example

Set a batch of properties:

myComponent.setProperties({"prop1": "value1", "prop2.subprop": "value2", "prop3": "value3"});

setProperty(property, value) : {void}

Sets a property or a subproperty (of a complex property) and notifies the component of the change, triggering a [property]Changed event. The value should be of the same type as the type of the attribute mentioned in this API document.
Parameters:
Name Type Description
property string The property name to set. Supports dot notation for subproperty access.
value any The new value to set the property to.
Since:
  • 4.0.0
Returns:
Type
void
Example

Set a single subproperty of a complex property:

myComponent.setProperty('complexProperty.subProperty1.subProperty2', "someValue");